Dynamo-electric machinery.



PATENTED NOV. 5, 1907. C. A. PARSONS & J. H. ARMSTRONG.

DYNAMO ELECTRIC MACHINERY.

APPLICATION FILED FEB. 10, 1906.

2 SHEETS-$113111 l.

Jko'cnlozq Uzarza .7%zmww F j 7 7 lfr/zuf/v/If 7. MW V No. 869,934.PATENTED NOV; 5, 1907. C. A. PARSONS & J. H. ARMSTRONG. DYNAMO ELECTRICMACHINERY.

APPLICATION FILED $213.10, 1906.

2 SHEETS--SHEET 2.

UNITED STATES PATENT OFFICE.

CHARLES ALGERNON PARSONS AND JOHN HUTTON ARMSTRONG, OF NEWCASTLE-UPON-TYNE, ENGLAND; SAID ARMSTRONG ASSIGNOR TO SAID PARSONS.

nYNAMo-ELEc'rmc MACHINERY.

Specification of Letters Patent.

Patented Nov. 5, 1907.

Application filed F br arv 10. 1906. Serial No. 300.483.

Charles Algernon Parsons and George Gerald Stney,-a v

compensating winding is described in which the copper conductor in theform'of an insulated strip is wound continuously'round slots in the polefaces of the field magnets. This method of construction, however, isdiiiicult to carry out in practice on account of the stiffness of theconducting strips, and also on account of the, difficulty of placing thestrip in the slots or holes in the pole faces.

The object of our invention is tool'iviste this difficulty and toconstruct the winding in such a manner. that it can be readily andeasily placed in position without danger of injuring the insulation ofthe winding.

The invention. consists in making each bar or strip of the windingseparate and approximatelystraight, the ends of these straight piecesbeing coupled together by vsuitably attached connecting pieces.

The invention also consists in fixing the compensating winding inposition on the pole faces between strips .of magnetic material lyingparallel with the axis of the armature and attached to the pole facesbybolts or other means.

' The invention furtherconsists in an improved coupling between the barsorstrips and connecting pieces.

By means of our invention we are elm-bled to ut the winding into placewithout risk of damage to the insulation and we have also found that, bythe new construction betterventilation can be provided tit the ends forthe armature, and for the compensating winding itself.

Referring to the accompanying dniwings: Figure I is an end elevation of:1 four polo dymi mo to which our invention is applied, the compensatingcoils on the lower half being removed; Fig. 2 is a diagrammatic viewshowing the arrangcmcnt of thc compensating Winding; Fig. 3 is a sectionthrough one of thc flanged strips of Fig. 1; Fig. 4 is a plan and Fig. 5an elevation showing the means employed for con nc'cting up i he scpzvrate parts of-the compensating winding.

1n the arrangement illustrated the field mognett'nimc, a, is providedwith four projecting pole pieces, I), on

which the field coils, c, are wound in any usual manner., Thccompensating winding is placed uniformly on the pole faces and comprisesfour coils having their axes between the polar axes of the field magnetsas shown diagrammatically in Fig. 2. The coils are made up of a numberof separate copper strips, (I, joined up at their ends by other copperstrips 0. and are arranged to give electrically the same effect as isgiven by the Winding shown diagrannmu'icslly in Fig. 2 in which thecoils are placed in series with the armature and so arranged that thecurrent in any particular conductor is opposite to that in the nearestarmature conductors when the machine isin operatiori. The copper strips,1!, are held on the pole faces by means oi flanged stripsf. of magneticmaterial which fit'into shallow grooves. g. in the pole faces thegrooves being parallel to the axis of the armsture. The strips, f. maybe fixed to the pole faces in any convenient manner, as for instance asshown in Figs.

land 3 by means of a clamping strip, h, fitting over pro- I jection, la,on the flanged strips, f, and bolted to the body of the pole pieces, Thecopper strips, d, placed between the strips. f. are in this manner heldfirmly on i the pole faces and their ends are joined up so as to form a.continuous electric circuit surrounding thc armature as shown in Fig. 2.This may be effected for instance by flattening the ends of the stripsto about half the thickness of their main portions a (lie or otherstlitable-means, the connecting strips, 6. being then joined to thestrips. 1/, by bolts and nuts or in another suitable manner. It will beseen that by flattening the ends of the strips a larger area of contactat thejoin't is obtained. The whole joint may if desired be brazed orsoldered together after completion. a

Having thus described our invention, What we claim as new and desired tosedune by Letters Patent is 1. in dynamo electric machinery. a fieldwinding cunprising a plurality of separate nietaistrips. pole pieces.groovcs in the face of said pieces parallel to the axis of the machine.flanged elements oi magnetic material fitting in said grooves.projections on said elements. clumping 'picccs tit-ring over theprojections. und means clumping said pieces to the machine: as setforth.

2. In dynamo electric machinery. p.le pieces. an electrical winding,meuns fixing suid winding to said pole pieces complzisiu; grooms in theface of the pole pieces puruilcl to the axis of the nmchine. flangedelements of magnetic material liliillf: into the grooves.l)l't)j(t'.l0|l.\ on said cicntcnrs clamping pieces fitting over thepl'ojccti ns. and means attaching said clumping pieces t) the machine;as sci i'orih.

In testimony uhcrcof \vc huvc signed our numcs to this spcciliczllion inthc prcscucc of two subscribing witness-cs.

